We wish you and your family good health.
If your veset is during the day, i.e., your last period began during the day, and you are observing the night as an onat perishah out of stringency, then you may immerse and even have relations tonight.
If your veset is at night, then you should not have relations, even on mikveh night. There is debate about whether immersion itself is permitted for the purpose of other physical contact under these circumstances. Our site’s rabbinic supervisor, Rav Yehuda Henkin, permits immersion in this case.
Please let us know if we can be of further assistance.